Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 32, p.53. Works number was 33200 in February 1909.
Puerto-Rican sugar-plantation saddle tanker for the Guantanamo Sugar Company's 13 1/2-mile (21.7-km) narrow-gauge line. The specification requires the 1 to haul 12-15 short tons of "cars & lading" up a straight 1/2% grade with frictional resistance not to exceed 15 lb per ton (7.5 kg per tonne) and to control about twice as much train load heading downgrade.
Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 79. p. 60. Works number was 60195 in September 1927.
Locobase 13336 shows the first of these really small saddle tanks. When the Puerto Rican sugar mill ordered a second locomotive eighteen years later, they went for slightly more of everything: cylinder volume, tubes for more heating surface, and a larger firebox. All this was available for a mere two short tons (1,814 kg). Like the earlier engine, the 12 was challenged by curves with radii as tight as 50 feet (16 metres).
| Principal Dimensions by Steve Llanso of Middle Run Media | ||
|---|---|---|
| Class | 1 | 12 |
| Locobase ID | 13336 | 15421 |
| Railroad | Central Los Canos | Central Los Canos |
| Country | USA | USA |
| Whyte | 0-4-2ST | 0-4-2ST |
| Number in Class | 1 | 1 |
| Road Numbers | 1 | 12 |
| Gauge | 66 cm | 66 cm |
| Number Built | 1 | 1 |
| Builder | Burnham, Williams & Co | Baldwin |
| Year | 1909 | 1927 |
| Valve Gear | Stephenson | Stephenson |
| Locomotive Length and Weight | ||
| Driver Wheelbase (ft / m) | 3.67 / 1.12 | 3.75 / 1.14 |
| Engine Wheelbase (ft / m) | 8.50 / 2.59 | 9.58 / 2.92 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.43 | 0.39 |
| Overall Wheelbase (engine & tender) (ft / m) | 8.50 / 2.59 | 9.58 / 2.92 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
| Weight on Drivers (lbs / kg) | 17,000 / 7711 | 19,000 / 8618 |
| Engine Weight (lbs / kg) | 21,000 / 9525 | 25,000 / 11,340 |
| Tender Loaded Weight (lbs / kg) | ||
| Total Engine and Tender Weight (lbs / kg) | 21,000 | 25,000 |
| Tender Water Capacity (gals / ML) | 300 / 1.14 | 350 / 1.33 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 0.50 / 1 | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 14 / 7 | 16 / 8 |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter (in / mm) | 24 / 610 | 28 / 711 |
| Boiler Pressure (psi / kPa) | 150 / 1030 | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 7" x 12" / 178x305 | 8" x 12" / 203x305 |
| Tractive Effort (lbs / kg) | 3124 / 1417.02 | 3730 / 1691.90 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.44 | 5.09 |
| Heating Ability | ||
| Tubes (number - dia) (in / mm) | 46 - 1.5" / 38 | 57 - 1.5" / 38 |
| Flues (number - dia) (in / mm) | ||
| Flue/Tube length (ft / m) | 6.26 / 1.91 | 6.66 / 2.03 |
| Firebox Area (sq ft / m2) | 18.60 / 1.73 | 24.40 / 2.27 |
| Grate Area (sq ft / m2) | 4.52 / 0.42 | 6.27 / 0.58 |
| Evaporative Heating Surface (sq ft / m2) | 130 / 12.08 | 172 / 15.98 |
| Superheating Surface (sq ft / m2) | ||
| Combined Heating Surface (sq ft / m2) | 130 / 12.08 | 172 / 15.98 |
| Evaporative Heating Surface/Cylinder Volume | 245.28 | 245.71 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 678 | 1003 |
| Same as above plus superheater percentage | 678 | 1003 |
| Same as above but substitute firebox area for grate area | 2790 | 3904 |
| Power L1 | 2525 | 3136 |
| Power MT | 654.90 | 727.76 |